The heart is a 2 loop pumping system. This powerpoint outlines the pathway of blood between the heart, lungs, and body while exchanging carbon dioxide and oxygen. It is designed to have students drawing/labeling and describing what happens when our hearts beat and sending blood through the body and lungs. This can be used as an introduction, review, or modified as an assessment. I numbered the diagram to match a heart coloring worksheet I got from teachers pay teachers so the students could cross reference the two assignments for consistency.